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Chap.14 earthscience

Geologic Time

QuestionAnswer
division of Earth's history into time units based largely on the types of life-forms that lived only during certain periods geologic time scale
longest subdivision in the geologic time scale is based on the abundance of certain types of fossils and is subdivided into eras, periods, and epochs eons
second-longest division of geologic time; is subdivided into periods and is based on major worldwide changes in types of fossils eons
next-smaller division of geologic time after the period; is characterized by differences in life-forms that may vary regionally epoch
are units of geologic time characterized by the types of life existing worldwide at the time periods
change of organisms over a geologic time organic evolution
group of organisms that reproduces only with other members of their own group species
is a process by which organisms with characteristics that are suited to a certain environment have a better chance of surviving and reproducing than organisms that do not have these characteristics natural selection
organism with a three-lobed exoskeleton that was abundant in Paleozoic oceans and is considered to ba an index fossil trilobite
large ancient landmass that was composed of all the continents joined together Pangaea
is the longest part of Earth's history and includes the Hadean, Archean, and Proterozoic Eons Precambrian time
are blue-green algae thought to be one of the earliest forms of life on Earth cyanobacteria
or era of ancient life, began about 544 millioin years ago and ended about 248 million years ago Paleozoic Era
or era of middle life, was a time of many changes on Earth Mesozoic Era
or era of recent life, began about 65 million years ago and continues today Cenozoic Era
Created by: aereed
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